(19)
(11) EP 0 587 422 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
17.07.1996 Bulletin 1996/29

(43) Date of publication A2:
16.03.1994 Bulletin 1994/11

(21) Application number: 93307087.2

(22) Date of filing: 08.09.1993
(51) International Patent Classification (IPC)5: G03G 15/08
(84) Designated Contracting States:
DE FR GB

(30) Priority: 09.09.1992 JP 240662/92

(71) Applicants:
  • KABUSHIKI KAISHA TOSHIBA
    Kawasaki-shi, Kanagawa-ken 210 (JP)
  • Kabushiki Kaisha TEC
    Shizuoka (JP)

(72) Inventors:
  • Tanuma, Chiaki
    1-1, Shibaura 1-chome, Minato-ku, Tokyo (JP)
  • Saito, Mitusnaga c/o Intel. Prop. Div.,
    Minato-ku, Tokyo (JP)
  • Osugi, Yukihiro c/o Patent Dept.
    Chiyoda-ku, Tokyo (JP)

(74) Representative: Freed, Arthur Woolf et al
MARKS & CLERK, 57-60 Lincoln's Inn Fields
London WC2A 3LS
London WC2A 3LS (GB)

   


(54) Developing apparatus


(57) A developing apparatus (13) using a single component toner, the apparatus comprising a first toner carrier (14) for holding the single component toner on the peripheral surface, a first regulating member (14a) in contact with the first toner carrier (14), a second toner carrier (15) for holding the single component toner and for relatively approaching to or coming in contact with the first toner carrier (14) so as to transfer the single component toner to the first toner carrier (14), and a second regulating member (15a) in contact with the second toner carrier (15). The first toner carrier (14) or the second toner carrier (15) is adapted to relatively and selectively approach to or come in contact with the electrostatic latent image holding member (10) and transfer to the electrostatic latent image holding member (10) either a single component toner held on the first toner carrier (14) or a single component toner which resides on the second toner carrier (15) after the single component toner has been transferred from the second toner carrier (15) to the first toner carrier (14) so as to develop the electrostatic latent image to the visible image with the single component toner.






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